Given Cassandra 2.0 is not compatible at this time I think the only relevant part of the paragraph is a pointer to the potential of a 1.2 homebrew, but I think even that is a little too much.

Would rather we point them to CCM to manage Cassandra versions since it lets you install and manage many different versions of Cassandra and should also work cross-platform. I'm not suggesting you write instructions on CCM for this PR, but this paragraph can mostly be removed.